Select special

Question

Hi Everyone, could you help me please?
My trouble is this:
I have a table with three columns like this
IDX NAME NUMBER
1 A 30
2 B 10
3 C 30
4 D 20
1 A 10
2 B 20
4 D 20
IDX isn't a primary key. Number is a foreing key. I need a select where I display distinct NAME order by NUMBER.
Thanks for your help.

Answer 1

>
I have a table with three columns like this
IDX NAME NUMBER
>
Really? NAME and NUMBER are terrible choices for column names as they are Oracle reserved words. Change these to avoid future problems.
I need a select where I display distinct NAME order by NUMBER.Meaning what? There are multiple NUMBERs per NAME: order by which? Depending on this, there are some NAMEs that can correspond to the same NUMBER: does this need to be resolved by further ordering?
SQL> with t as (
  2    select 1 idx, 'A' z, 30 x from dual
  3    union all
  4    select 2, 'B', 10 from dual
  5    union all
  6    select 3, 'C', 30 from dual
  7    union all
  8    select 4, 'D', 20 from dual
  9    union all
10    select 1, 'A', 10 from dual
11    union all
12    select 2, 'B', 20 from dual
13    union all
14    select 4, 'D', 20 from dual)
15  select
16            z
17  from
18            (select
19                z
20                 , min(x) min_x
21                 , max(x) max_x
22            from
23                t
24            group by
25                z)
26  order by
27*            min_x /* or max_x */
SQL> /
Z
A
B
D
C